A rocket engine that could power United Launch Alliance’s next-generation rocket has passed a major design review, clearing the way for full-scale hotfire testing starting next year and certification for test flights in 2019, according to Aerojet Rocketdyne, the powerplant’s developer.

NASA and U.S. military officials are reviewing a malfunction that triggered a premature engine shutdown during a flight of a SpaceX Falcon 9 rocket earlier this month, a cautionary step before upcoming launches with a GPS navigation satellite and astronauts on SpaceX’s Crew Dragon spacecraft.

Watch a replay of the United Launch Alliance Delta 4 rocket launching from Vandenberg Air Force Base in California, hauling into orbit a new eye in the sky for the National Reconnaissance Office.